题目信息
The average (arithmetic mean) cost per book for the 12 books on a certain table is k dollars. If a book that costs 18 dollars is removed from the table and replaced by a book that costs 42 dollars, then in terms of k, what will be the average cost per book, in dollars, for the books on the table?
A:k + 2
B:k - 2
C:$${12}+\frac{24}{k}$$
D:$${12}-\frac{24}{k}$$
E:12k - 6
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正确答案：
A:k + 2
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